A few free WPF Controls from Mindscape (limited time offer, reg-ware)

Mindscape - Free WPF controls from Mindscape!

"To celebrate the release of WPF Elements 4.0, we’re pleased to announce that you can now download a free version containing fully functional versions of the CoverFlow, AutoCompleteBox and PromptDecorator controls. You can use these controls to create attractive, helpful user experiences and it won’t cost you a cent!

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I like free... Free and OSS/source available is better, but free is still good... :)